What kind of grinder should I choose at home?

November 21, 2022

Although the knife plate Coffee Grinder is an obvious winner, not all knife plate coffee grinders are the same. From shape to size and material, there are great differences.

(1) Shape
There are mainly two shapes of knife disc Electric Coffee Grinder: flat knife disc and cone knife disc. The debate about which is better continues. The hand grinder often uses a cone cutter head, while the flat cutter head is favored by manufacturers of high-quality electric bean grinder.
The working modes of the two types of cutter heads are slightly different, but in general, the results are similar. Generally speaking, the flat cutter head is more expensive and stable; Conical cutter head is cheaper and less noisy.

(2) Dimensions
There are many different sizes of the Electric Grinder cutterhead. This measurement is usually in millimeters (mm), which is the diameter of the largest cutter head.
The cutterhead of household electric bean grinder usually starts from about 40mm, while the commercial type starts from about 60mm, which can reach more than 100mm. As the size of the cutter head increases, the size of the grinder itself will also increase. Generally speaking, the larger the cutter head is, the better the performance is, the more stable, faster, and more efficient it is. It usually requires less grinding adjustment.

(3) Correction and accuracy
For the bean grinder cutter head, calibration and accuracy are equally important. If the cutter head is not accurately calibrated, the perfect grinding size will become more difficult to achieve. In order to achieve good particle distribution, accurate correction is mandatory. This is more important for larger cutter heads.
If there is too much space between the cutter heads, it is impossible to obtain a perfect particle distribution. The extraction of smaller and larger particles is different. If the difference between particles is too large, insufficient extraction and over extraction will occur simultaneously, making a cup of coffee with good balance difficult to reach.

(4) Materials
The cutterhead of the grinder is usually metal or ceramic. The metal cutter head is more durable, more expensive, and usually more accurate; The heat dissipation capacity of ceramic cutter head is good.
Try to avoid using ceramic discs. Although they are cheaper and they are indeed grinding coffee, ceramic teeth are usually not sharp and easy to wear. They will produce too much dust, which will affect the particle size and distribution, thus forming a "stuffy" taste.
Some bean grinders can be replaced with cutter discs of different materials. The metal cutter head is generally made of fine steel. Ordinary steel is relatively easy to cut, but they will be oxidized and rusted. In order to make the cutter head durable and sharp, it should be hardened by overheating, or coated with a hard material (such as titanium).
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